[R-390] RF Deck B+ short (390A)

[Drew P. via R-390]

Cecil wrote:

[snipped]

"I wasn't suggesting wholesale replacement of all capacitors...just the papers that have proven themselves to have a much higher than normal failure rate and only in the "A" model receiver.  If these receivers had been built with the metal cased glass sealed caps of the R-390/URR we wouldn't be having this conversation."

The "filter killer" cap (C-553) in the R-390A is of the same type as the metal cased glass sealed caps of the R-390/URR (aka "Vitamin Q"). Is there something special about the R-390/URR which precludes the possibility of these caps failing?  Is there something special about the R-390A which causes rampant failures of these caps?  Perhaps it is Murphy's Law, given the value and unobtanium status of the R-390A's mechanical filters.

Drew